Zinc-Lead-Cadmium Rolled Zinc Alloy (Z21721)
Z21721 zinc is an otherwise-unclassified alloy of zinc. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a moderately low heat capacity and a moderately low tensile strength among zinc alloys. The graph bars on the material properties cards below compare Z21721 zinc to other zinc alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
87 GPa 13 x 106 psi
Elongation at Break
40 %
Poisson's Ratio
0.25
Shear Modulus
35 GPa 5.0 x 106 psi
Tensile Strength: Ultimate (UTS)
150 MPa 22 x 103 psi
Tensile Strength: Yield (Proof)
120 MPa 18 x 103 psi
Thermal Properties
Latent Heat of Fusion
110 J/g
Maximum Temperature: Mechanical
90 °C 190 °F
Melting Completion (Liquidus)
410 °C 770 °F
Melting Onset (Solidus)
390 °C 740 °F
Specific Heat Capacity
390 J/kg-K 0.093 BTU/lb-°F
Thermal Conductivity
110 W/m-K 65 BTU/h-ft-°F
Thermal Expansion
26 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
27 % IACS
Electrical Conductivity: Equal Weight (Specific)
37 % IACS
Otherwise Unclassified Properties
Base Metal Price
11 % relative
Density
6.6 g/cm3 410 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
53 MJ/kg 23 x 103 BTU/lb
Embodied Water
340 L/kg 41 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
57 MJ/m3
Resilience: Unit (Modulus of Resilience)
88 kJ/m3
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
22 points
Strength to Weight: Axial
6.4 points
Strength to Weight: Bending
9.6 points
Thermal Diffusivity
44 mm2/s
Thermal Shock Resistance
4.8 points
Alloy Composition
| Zn | 98.9 to 100 | |
| Pb | 0 to 1.0 | |
| Cd | 0 to 0.070 | |
| Ti | 0 to 0.020 | |
| Fe | 0 to 0.010 | |
| Cu | 0 to 0.0050 | |
| Al | 0 to 0.0020 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B69: Standard Specification for Rolled Zinc
Corrosion Resistance of Zinc and Zinc Alloys, Frank C. Porter, 1994
Zinc Handbook: Properties, Processing, and Use In Design, Frank C. Porter, 1991
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015